Common mode filter

A common mode filter, comprising:

• a magnetic substrate;
• an insulating layer on which the magnetic substrate is provided and in which first and second coil layers electromagnetically coupled to each other are disposed;
• a pair of external terminals provided on the insulating layer and connected to ends of the first coil layer through a via electrode, and a pair of external terminals provided on the insulating layer and connected to ends of the second coil layer through a via electrode;
• a first ESD prevention member connecting between the pair of external terminals carrying electric current with the first coil layer and a second ESD prevention member connecting between the pair of external terminals carrying electric current with the second coil layer;
• and
• a ground electrode provided on the insulating layer and connecting the first ESD prevention member to the second ESD prevention member, wherein the ground electrode has a stepped portion formed at the center.